"Mantool" is the word for male genitalia used exclusively by London's finest gentlemen. It has neither to do anything with men nor with tools, but comes from the Latin word "mentula" meaning the exactly same thing.

Earnest:"Won’t you come and take seat here on my mantool, Gwendolen?."
Gwendolen:"Why, certainly! That would be quite comfortable. That would be exactly what I need right now, Earnest."